I'm a doctor, not a...

I'm a doctor, not a... is a famous catch phrase and snowclone used in Star Trek. Originally used by Dr. Leonard McCoy in Star Trek: The Original Series, the phrase lived on in various other incarnations of Star Trek and was used by both Julian Bashir and The Doctor, among others. Dr. McCoy's original delivery of the phrase varied with emotional intensity, from extreme frustration to light-hearted sarcasm. Subsequent uses in later series also mirrored this performance. This iconic phrase has also appeared in other media as both a parody and homage to the show. Very often, it was just the way of Dr. McCoy and subsequent characters to prevent criticism in case of failure, but also often, the "not a..." ability is successful, especially in dire needs.

According to screenwriter Roberto Orci, the line "I'm a doctor, not a physicist," was one of several "nods" to the original series that the writers tried to make seem natural, rather than shoe-horned-in efforts to win goodwill from the fans. "That sort of line and that sort of coupling," said Orci, "is good in any context whether it's the first time or the tenth time you've heard Bones say something like that, because it was specific to the situation and it was elucidating to his character." (SFX, issue #200, p. 60)

According to the official Robert Picardo websitewbm, during Picardo's audition, the final scripted line for the reading was, "I believe someone has failed to terminate my program," and he finished his audition with the ad libbed "I'm a doctor, not a nightlight." However, when encountering the example in "Phage", Picardo was apparently unfamiliar with the tradition at first. He later recalled, "When I read that script I just thought it was a joke. Then I was told on the set this is a Bones line. I guess I remember him saying lines like that." (Cinefantastique, Vol. 27, No. 4/5, p. 40)

The example from "Parturition" was invented by Picardo himself. He remembered, "I suggested the 'I'm a doctor, not a voyeur' line, which also made it into [an] episode." (Cinefantastique, Vol. 28, No. 4/5, p. 97)

By the end of the second season of Voyager, Robert Picardo had become aware of the audience's appreciation for these lines and had invented a version that ultimately never made it into an episode. The actor commented, "The audience seems to get a kick out of whenever I invoke the spirit of Dr. McCoy." Laughing, Picardo added, "I hope someday to have a scene with Harry Kim, where I say, 'Damn it, Kim, I'm a doctor not a blank [whatever task the script demands.]' That would really be tweaking them one step further." (Cinefantastique, Vol. 28, No. 4/5, p. 97)

While the character of Dr. McCoy arguably made the phrase "I'm a doctor ..." part of the common lexicon, he was not the first fictional doctor, or even the first character on the big screen, to coin the phrase. In the 1933 American film The Kennel Murder Case, Dr. Doremus, the coroner at the scene of the titular crime, states "I'm a doctor, not a magician," and "I'm a doctor, not a detective," within five minutes of his first appearance. The latter line was also uttered by Dr. Fortescue, played by George Zucco, in the 1949 version of The Secret Garden. It is unclear whether these particular dialog artifacts were progenitors of McCoy's famous phrase.

"I'm a [whatever] not a [whatever]" is also a Yiddish idiom, most commonly "I'm a [whatever,] not a rabbi."